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Published August 2005 | Published
Journal Article Open

Performance of the Monitoring Light Source for the CMS Lead Tungstate Crystal Calorimeter


Light monitoring will play a crucial role in maintaining energy resolution for the CMS lead tungstate crystal calorimeter at LHC. In the last several years, a laser based monitoring light source was designed and constructed at Caltech, and was installed and commissioned at CERN. This paper presents the design of the CMS ECAL monitoring light source and its performance during beam tests. Issues related to the monitoring precision are discussed.

Additional Information

© Copyright 2005 IEEE. Reprinted with permission. Manuscript received November 15, 2004; revised March 31, 2005. [Posted online: 2005-08-15] This work was supported in part by the U.S. Department of Energy under Grant DE-FG03-92-ER40701. The authors would like to thank the entire CMS ECAL collaboration for their effort, especially Dr. J. Bourotte, Dr. M. Dejardin, Dr. M. Haguenauer, Dr. J. Rander, and Dr. P. Verrecchia for many discussions.

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